[Mike C]

To Tim's point, Heddman the only source I found that reliably cleared clutch linkage. Most of the 2x4 headers hang WAY low since exhaust runs below the crossmember on the two wheel drive but through it on the four wheel drive.

I ran Heddmans on my Jimmy for 10 years or so and ditched them for the straight dump manifolds with the 2 1/2" outlet as were found on the Corvettes of the mid 60's. At $59 each, they seem like the best way to go but they are more difficult to plumb on a 2x4. Not impossible but more difficult for sure. If I was going for a max effort build making power well north of 5000 rpm I'd run headers, otherwise the manifols.

For a truck with a truck size cam, I like manifolds and the best flowing exhaust you can attach to them. I have screwed together a couple of 427's in the last year. One is an L36 from a 69 Corvette that has 10:1 compression and a Comp Nitrous grind cam hydraulic roller. 224/236 @ .050 that I bought a set of Sandersons iron manifolds that were painfully expensive that I'm putting in my short step. The other is a cobbled together 454 block, GM steel crank and some thumb rods that has a Comp Marine 230/236 hydraulic roller that I bought a set of Heddman Elites for that is going in my Corvette as I am a little more concerned with max power on the car.